This video is about the Water Miser battery vent caps for flooded lead acid batteries. The caps are specifically designed to recover battery water and electrolyte with a condensation chamber. Caps shown in this video are the extended height model but there are others.
Links: http://www.flowsystemsusa.com/
Flow Systems YouTube channel: https://www.youtube.com/channel/UCwPxvknaMw7FuZvCiB-jCnw
Post time: Jan-22-2017